Dermatophytes
obtain nutrients from keratinized material from the hair, skin and
nail. Dermatophytes usually do not invade living tissue of the host,
but colonize the outer layer of the skin. Clinical condition known
as ring worm or tinea occurs due to host reaction to the invading
agent.

There are three genera belonging to Dermatophytes:

Microsporum:
Fungi in this genus invade hair and skin but not nail, produce numerous
macroconidia. Microconidia also present